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A. HAMBURGER. DEVELOPING, COLORING, AND WASHING TANK FOR TWO-SIDEDPHOTOGRAPH'IC FILMS.

APPLICATION FILED MAY'ZO, I9I9.

Patented July 1, 1919.

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specification of Letters 1 min.

Original application tiled January 20, 1919, Serial No. 272,801. Dividedand this application flied lay 20,

To all whom it may concern: I

Be it known that I, Anon HAMBURGER, a citizen ofthe United States ofAmerica, and residin at 38 Dover street, Mayfair, Lon- 1, Finland, haveinvented certain ing, Co1oring,.and WashingTank for Two- SidedPhotographic Films, of which the followingis a specification. Thisinvention relates to the pre aration of photographic reproductions of ojects in natural colors, and to. ap aratus therefor.

In my co-pending ap ication No. 272201, filed January 20, 1919, of whichthe present -case'is a division,) have described a multicolor process inwhich complementary color negatives say a red or orange red value nega-I tive and a b ue or blue green value negative,

one of which is reversed, are accurately superimposed, on op at sides ofa doubl sensitized film and p o hemically rinte The combined posit1ve isthen bleac ed and dyed or pigmented in separate or simultaneousoperations each side itsres ctive color, and may itself be used asaished two-color photograph or it may becombined after clearing with ayellow value positive reparedpreferably by the gzocess of my ritishPatent No. 20880, 1911 according to which mercury-silver iodid gives theyellow color.

This invention consists in apparatus adapted for simultaneous dyeing ofboth sides of a film such as a positive referred to above.

Referring to the accompanying drawi igure 1 is a side elevation of adyeing o.

frame constructed according to one fo my invention. I 1

' 2 is a sectional elevation'on line of Fig. 1..

iTwo rectangular frames a a of a .suitable size for the sitive film tobe treated are constructed s milar to rinting frames, but

the one is adapted to t into the. rabbet of the other, just as if itwere the glass of an ordinary printing frame. ,The ra bet of the oneframe is provided with rubber b or like jointin material, so that thefilm 0 when agejnst it around the ed a watertight joint. e secondrovided with a ringof material e film, elamping the latter Thetan areprovided with outlet passages g at their T lower ends, and theseare-controlled by suitable cocks or valves 71.. Inlets z z" are provided'at the top edges of the/tank chambers,

ptember 21,

272201, or maybe otherwise treated as described in that apa tan will beand is placed 1919. Serial No. 296,527.

against the edges of the frames and thus formin a tank chamber on eachside of the film. he two halves ofthe frame may be arranged for rapidopening and-closing by means'of hinges e aong the bottom edge and: winnuts'and screws {1 on the to ed e.

chamberson eac side of t e fi m for the admission of the dyeing fluids.Means are also'provided for the outlet of air by the valves is k asthefiuid is introduced. The air. exit valves is k may be adapted to beclosed at will. To prevent saggingof the film, the two fluids may beintroduced simultaneously. The film prepared according to one of themethods described in" my co-pending application No.

272201 is introduced into the dyeing tank clamped therein and dyed bythe introduction of the appropriate dyeing fluids on each I side; Thefilm may thus be simultaneously dyed on both sides. The dyeing fluidsare then run off, and he positive thoroughly washed, until. all t dinaryway.

- The positive film thus obtained can then be combined with a yellowtoned positive as described in my co-pendingapphcation No. mounted on'paper or plication. I 'I claim:

- 1. Means for dyeing the two' sides of a film ractically s'imultaneouslcomprising in which a film may ored, including a tank comprising tworectangular frames'capable of fitti tother, means adaptedto clamp each 0said ames; to said film, inletand outlet means for each of the twocompartments into which 119 Patented Jul 1, 1919. l

e non-silver parts are cleared of dye. Fixinglis then effected in asolution of sodium t' placed and ,held' to form a complete partitiontherein aratus for a multi color photo the tank is divided by said film,means for admitting coloring fluid to each of said compartments, and forwithdrawing the same, and air escape means for each of saidcompartments.

3. Apparatus for multi-color photography in which two sides of a filmare to be colored, including a tank comprising two rectangular framescapable of fitting together,ih1nges connecting said frames to eachother, jointing material applied to the frames, means adapted to clampboth frames and jointing material against the film, inlet and outletconnections for each of the two compartments into which the tank isdivided by said film, means for admitting treating liquid to each ofsaid two compartments, and for withdrawing the same therefrom andregula'ble air escape connections for each of said compartments.

4. A tank capable of being divided by a film into two compartments forseparately treating the two sides of a photographic film, said tankcomprising a receptacle having means for locking a film into a positionin which it will divide the tank into two mutually liquid-tightcompartments, each provided with a liquid inlet and a liquid outlet.

5. A tank for separately treating the two sides of a photographicsheet-form element, which comprises a receptacle of which the side wallsare each rigidly attached to longitudinal parts of the bottom, top andend walls, each set of said longitudinal parts forming a frame, and saidtwo frames being hinged to each other, liquid tight packing ringscarried by each of said frames where said two frames meet, such ringsbeing capable of supporting a photographic sheetform element to separatesaid tank into two mutually liquid-tight compartments, a liquid inletand a liquid outlet connection for each of said compartments.

In testimony whereof I have signed my name to this specification.

ARON HAMBURGER.

